If you think about how it works when cups are stacked. you will begin with the height of the cup plus the height of the lip you would then add just the heigt of the lips until you get to the height needed. so your answer should be 19 cups
1- B 2- C 3- B 4- D 5- D 6- C 7- B 8- C 9- C 10- C
Hope I helped you!! I really think that I got them all right.. PLEASE tell me if I got any wrong so that I can change them :) Its been a while since I've done this... XD